Imported Upstream version 3.5-36

1 files changed, 96 insertions, 0 deletions

diff --git a/mcon/U/i_ucontext.U b/mcon/U/i_ucontext.U
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+?RCS: $Id: i_ucontext.U 167 2013-05-08 17:58:00Z rmanfredi $
+?RCS:
+?RCS: Copyright (c) 2012 Raphael Manfredi
+?RCS: 
+?RCS: You may redistribute only under the terms of the Artistic License,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic License; a copy of which may be found at the root
+?RCS: of the source tree for dist 4.0.
+?RCS:
+?MAKE:i_ucontext i_sys_ucontext: Inhdr cat echo n c rm \
+	+cc +ccflags +ldflags
+?MAKE:	-pick add $@ %<
+?S:i_ucontext:
+?S:	This variable conditionally defines the I_UCONTEXT symbol, and indicates
+?S:	whether a C program may include <ucontext.h> to get ucontext_t.
+?S:.
+?S:i_sys_ucontext:
+?S:	This variable conditionally defines the I_SYS_UCONTEXT symbol, and
+?S:	indicates whether a C program may include <sys/ucontext.h> to get
+?S:	ucontext_t.
+?S:.
+?C:I_UCONTEXT:
+?C:	This symbol, if defined, indicates to the C program that it should
+?C:	include <ucontext.h> to get at the user thread context.  A portable
+?C:	program must also check I_SYS_UCONTEXT for <sys/ucontex.h> inclusion,
+?C:	especially on OSX.
+?C:.
+?C:I_SYS_UCONTEXT:
+?C:	This symbol, if defined, indicates to the C program that it should
+?C:	include <sys/ucontext.h> to get at the user thread context.  A portable
+?C:	program must also check I_UCONTEXT for <ucontex.h> inclusion.
+?C:.
+?H:#$i_ucontext I_UCONTEXT		/**/
+?H:#$i_sys_ucontext I_SYS_UCONTEXT		/**/
+?H:.
+?T:working
+: see if this is a ucontext.h system
+set ucontext.h i_ucontext
+eval $inhdr
+
+: see if this is a sys/ucontext.h system
+set sys/ucontext.h i_sys_ucontext
+eval $inhdr
+
+: when both ucontext.h and sys/ucontext.h are available, check which one works
+case "$i_ucontext$i_sys_ucontext" in
+"$define$define")
+	echo " "
+	$cat >try.c <<'EOC'
+#ifdef I_UCONTEXT
+#include <ucontext.h>
+#endif
+#ifdef I_SYS_UCONTEXT
+#include <sys/ucontext.h>
+#endif
+
+int main(void)
+{
+	static ucontext_t u;
+	return (int) sizeof(u) & 0xff;
+}
+EOC
+	$echo $n "Checking whether including <ucontext.h> alone works...$c" >&4
+	working=
+	if $cc $ccflags -DI_UCONTEXT -o try try.c $ldflags >/dev/null 2>&1; then
+		working="$define"
+	fi
+	case "$working" in
+	"$define")
+		echo " yes." >&4
+		i_sys_ucontext="$undef"
+		;;
+	*)
+		echo "no." >&4
+		echo " "
+		$echo $n "Checking whether including <sys/ucontext.h> works...$c" >&4
+		working=
+		if $cc $ccflags -DI_SYS_UCONTEXT \
+			-o try try.c $ldflags >/dev/null 2>&1
+		then
+			working="$define"
+		fi
+		case "$working" in
+		"$define")
+			echo " yes, ignoring <ucontext.h>." >&4
+			i_ucontext="$undef"
+			;;
+		*) echo " no, we'll include both then." >&4;;
+		esac
+		;;
+	esac
+	;;
+esac
+$rm -f try.*
+